Three-dimensional printing

Abstract

An example of a three-dimensional (3D) printing kit includes a build material composition, an epoxy agent to be applied to at least a portion of the build material composition during 3D printing, and a fusing agent to be applied to the at least the portion of the build material composition during 3D printing. The build material composition includes a polyamide having an amino functional group. The epoxy agent includes an epoxy having an epoxide functional group to react with the amino functional group of the polyamide in the at least the portion. The fusing agent includes an energy absorber.

What is claimed is: 
     
       1. A three-dimensional (3D) printing kit, comprising:
 a dry build material composition including a polyamide powder having an amino functional group, the build material composition being devoid of an adhesive; and 
 a separate jettable epoxy agent to be applied to at least a portion of the build material composition during 3D printing, the jettable epoxy agent having a viscosity at 25° C. ranging from about 5 mPa·s to about 90 mPa·s and including an epoxy and an aqueous vehicle, the epoxy having an epoxide functional group to react with the amino functional group of the polyamide powder in the at least the portion. 
 
     
     
       2. The 3D printing kit as defined in  claim 1 , further comprising a fusing agent to be applied to the at least the portion of the build material composition during the 3D printing, the fusing agent including an energy absorber. 
     
     
       3. The 3D printing kit as defined in  claim 1  wherein the aqueous vehicle includes a co-solvent, a surfactant, and a balance of water. 
     
     
       4. The 3D printing kit as defined in  claim 1  wherein the epoxy is present in the jettable epoxy agent in an amount ranging from about 5 wt % to about 50 wt %, based on a total weight of the jettable epoxy agent. 
     
     
       5. The 3D printing kit as defined in  claim 1  wherein the epoxy is water-soluble. 
     
     
       6. The 3D printing kit as defined in  claim 1  wherein the polyamide powder includes polyamide particles having an average particle size of from about 2 μm to about 200 μm. 
     
     
       7. The 3D printing kit as defined in  claim 1  wherein the dry build material composition further includes glass dry blended with or encapsulated by the polyamide powder. 
     
     
       8. The 3D printing kit as defined in  claim 7  wherein the glass has an average particle size of from about 5 μm to about 100 μm. 
     
     
       9. The 3D printing kit as defined in  claim 1  wherein the dry build material composition consists of the polyamide powder having the amino functional group. 
     
     
       10. A three-dimensional (3D) printing kit, comprising:
 a dry build material composition including a polyamide powder having an amino functional group, the build material composition being devoid of an adhesive; and 
 a separate jettable epoxy agent to be applied to at least a portion of the build material composition during 3D printing, the jettable epoxy agent including an epoxy and an aqueous vehicle, the epoxy having an epoxide functional group to react with the amino functional group of the polyamide powder in the at least the portion, wherein the epoxy is selected from the group consisting of 2-ethylhexyl glycidyl ether, phenol (EO) 5 glycidyl ether, p-tert-butylphenyl glycidyl ether, dibromo phenyl glycidyl ether, lauryl alcohol (EO) 15 glycidyl ether, resorcinol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, diglycidyl terephthalate, diglycidyl o-phthalate, N-glycidyl phthalimide, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, and a combination thereof. 
 
     
     
       11. The 3D printing kit as defined in  claim 10 , further comprising a fusing agent to be applied to the at least the portion of the build material composition during the 3D printing, the fusing agent including an energy absorber. 
     
     
       12. The 3D printing kit as defined in  claim 10  wherein the aqueous vehicle includes a co-solvent, a surfactant, and a balance of water. 
     
     
       13. The 3D printing kit as defined in  claim 10  wherein the epoxy is present in the jettable epoxy agent in an amount ranging from about 5 wt % to about 50 wt %, based on a total weight of the jettable epoxy agent. 
     
     
       14. The 3D printing kit as defined in  claim 10  wherein the polyamide powder includes polyamide particles having an average particle size of from about 2 μm to about 200 μm. 
     
     
       15. The 3D printing kit as defined in  claim 10  wherein the dry build material composition further includes glass dry blended with or encapsulated by the polyamide powder. 
     
     
       16. A three-dimensional (3D) printing kit, comprising:
 a dry build material composition including a polyamide powder having an amino functional group, the build material composition being devoid of an adhesive; and 
 a separate jettable epoxy agent to be applied to at least a portion of the build material composition during 3D printing, the jettable epoxy agent including an epoxy and an aqueous vehicle, the epoxy having an epoxide functional group to react with the amino functional group of the polyamide powder in the at least the portion, wherein the epoxy is selected from the group consisting of 2-ethylhexyl glycidyl ether, phenol (EO) 5 glycidyl ether, p-tert-butylphenyl glycidyl ether, dibromo phenyl glycidyl ether, lauryl alcohol (EO) 15 glycidyl ether, resorcinol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycidyl terephthalate, diglycidyl o-phthalate, N-glycidyl phthalimide, ethylene glycol diglycidyl ether, and a combination thereof. 
 
     
     
       17. The 3D printing kit as defined in  claim 16 , further comprising a fusing agent to be applied to the at least the portion of the build material composition during the 3D printing, the fusing agent including an energy absorber. 
     
     
       18. The 3D printing kit as defined in  claim 16  wherein the aqueous vehicle includes a co-solvent, a surfactant, and a balance of water. 
     
     
       19. The 3D printing kit as defined in  claim 16  wherein the epoxy is present in the jettable epoxy agent in an amount ranging from about 5 wt % to about 50 wt %, based on a total weight of the jettable epoxy agent. 
     
     
       20. The 3D printing kit as defined in  claim 16  wherein the polyamide powder includes polyamide particles having an average particle size of from about 2 μm to about 200 μm.